added readme

README.md

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+# trivy-plugin-aqua
+A [Trivy](https://github.com/aquasecurity/trivy) plugin that scans infrastructure as code templates
+
+## Install
+
+```
+$ trivy plugin install github.com/aquasecurity/trivy-plugin-aqua
+$ trivy aqua -h
+Usage: trivy aqua [-h,--help] TYPE NAME [TRIVY OPTION]
+ A Trivy plugin that scans infrastructure as code templates.
+
+Options:
+  -h, --help    Show usage.
+
+Examples:
+  # Scan an IaC file
+  trivy plugin run aqua iac --aqua-key <key> --aqua-secret <secret> <target>
+
+```
+
+## Usage
+Trivy's options need to be passed after `--`.
+
+```
+# Scan an IaC file
+trivy plugin run aqua iac --aqua-key <key> --aqua-secret <secret> <target>
+```
+